The factory tires on a US-spec 2012 Honda Civic LX are 195/65R15, mounted on 15-inch wheels.
This size corresponds to the LX’s base wheel package and is common for that model year. If your Civic has been re-fitted with different wheels or tires, it may wear a different size, so always verify the exact specification for your vehicle.
Stock tire size for the 2012 Civic LX
Notes for replacement or upgrades
If you are replacing tires or upgrading wheels, be mindful of overall diameter to avoid affecting the speedometer, odometer, and vehicle dynamics. When in doubt, stick with the OEM size (195/65R15 for the LX) or consult a professional to ensure any alternate size maintains proper clearance and load/speed ratings.
Summary
In short, the standard tire size for a US-spec 2012 Honda Civic LX is 195/65R15 on 15-inch wheels. Always verify with the door jamb placard and owner’s manual, especially if your car has aftermarket wheels or regional variations.